Infrared thermography is often used to assess body temperature. It is a useful diagnostic tool for detecting human diseases but, nowadays, is has found a new applicability as an instrument of control during the crisis of the COVID-19 pandemic. Some authors also used it to assess thermal comfort inside buildings. However, some understudied issues still remain regarding the influence on the measurement of the environmental conditions, the position of the subject and the equipment characteristics.

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... This paper attempts to address some of these issues, highlighting that ambient temperature has an impact on image resolution. Additionally, the position of the subject is a key parameter when assessing body temperature, and different equipment deliver different results.